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Once you start seeing artifacts on the screen, the graphics card is either not getting enough voltage, or its being stressed too much (especially if you're overclocking a lot with stock cooling). If...

It depends on how much of your CPU (including cores, if you have a multi-core CPU) and RAM you allocate. I have an AMD Phenom II X4 @ 3.0 GHz and 4GB of RAM and I can run 4 VMs at once. Of course, it...